Please note that for the Sonoff firmware, you should not update to a new version, as during the firmware update process, if there are network or power issues, the Sonoff could malfunction and it will NOT be possible to restore the original firmware (it will become unusable).
All types of Sonoff can only be used with 2.4Ghz standard Wifi, the 5Ghz standard is not supported. You should set your router to broadcast a separate 2.4Ghz band to use with Sonoff.
The Sonoff Basic Wifi Remote Control Smart Switch is used to remotely control devices over the internet from anywhere with a network connection. The switch uses flexible, convenient Wifi connectivity, and the accompanying software connects to the device in just a few simple setup steps, making it suitable for remote control applications over the Internet, IoT, etc.
Technical specifications:
Model: Sonoff BASICR2 (international version) or Sonoff BASICCN (domestic version) Operating voltage: 90~ 250VAC Controls 1 device over the internet. Flexible Wifi connectivity, 2.4Ghz band (does not work with 5Ghz band, you should set your router to broadcast a separate 2.4Ghz band to use with Sonoff.) Load switching current: Max 10A Load switching power: 2200W(10A) Supports monitoring device operation status. Supports remote device switching over the internet. Supports 8 countdown/single/repeat timing tasks Compatible with Alexa. Compatible with Nest. Compatible software for iPhone, Android.